Trek Rail suspension bearing kit for 2020-2024. Covers all Rail frames (all generations, carbon fiber and alloy). Includes 12 pcs Enduro sealed cartridge bearings. 10 pcs are Enduro MAX bearings (full complement for greater load strength). 6 pcs are special double-row bearings. This kit INCLUDES all 4 shock mounting bearings (2 at the top and 2 at the bottom).